FOr the COwon X5 rockobox goes to 141gb I think. Maybe same thing with Ipod ?
Edit: I did actually find this: http://www.rockbox.org/twiki/bin/view/Main/BigDisk Archos can get storage of up to 160gb, and to access more than 137gb with Rockbox you have to follow the procedure outlined here.
Edit2: Bah, now I've wasted the entire day googling around about this. Seems I finally did find an answer, let me know if I'm off.
From the rockbox bigdisk page I linked to earlier:
"Two obstacles prevent easy use of the full capacity in an Archos:
* Rockbox doesn't use LBA48 (neither does the stock Archos firmware or BootBox), but this is a pure software issue.
* The USB to ATA bridge chip only does LBA28, we can't change that, no way to reach the upper part over USB. "
Clearly, we can use the procedure outlined above, but that would produce two drives out of one, where the USB can only address one and this is inconvenient to say the least.
However, the logical step is to check if the USB chip for the X5 also indeed only supports LBA28, before we start partitioning the HDD. Luckily, rockbox lists the hardware used in the X5, and we find the relevant chip to be: Cypress CY7C68310-80AC - USB to ATA/ATAPI Bridge. Rockbox also conveniently links to the datasheet for this chip, where it says:
• ATA/ATAPI-6 specification-compliant–provides support for mass storage devices larger than 137GB
I'm hoping this indicates I won't run into any problems using a 240gb drive, if I'm mistaken please let me know